Inverted incandescent lamp.



P. DAVIES.

INVBRTED INGANDESGENT LAMP.

APPLICATION FILED 001'. 1a, 1913.

1,105,259, Patented July 28, 1914.

WITH/8858 I lwavrpfi m W JXM 77W A NOR/VHS ms NORRIS Pzfrfks ca. PHOTO-LIfHO., WASHINGTON. o c,

unrTED STATES PATENT OFFICE.

PRESTON DAVIES, OF LONDON, ENGLAND, ASSIGNOR TO DEUTSCHE -GASGLll'I-ILICHT AKTIENGESELLSCHAFT (AUEBGESELLSCHAFT), OF BERLIN, GERMANY, A CORPO RATION OF GERMANY.

INVERTED INCANDESGENT LAMP.

Specification of Letters Patent.

Patented July 28, 1914.

7 Application filed October 16, 1913. Serial No. 795,479.

To all whom it may concern:

Be it known that I, PRESTON DAVIES, a subject of the King of Great Britain, and a resident of London, England, have invented certain new and useful Improvements in Inverted Incandescent Lamps, of which the following is a specification.

My invention relates to inverted incandescent lamps utilizing either gas or vaporized petroleum or the like as a fuel and has for its object to construct lamps of this description in a simple manner to insure a proper mixture of air and fuel whereby perfect combustion of'the fuel and a-maximum illuminating effect is attained. In attempting to secure this result it has heretofore been attempted to improve the Bunsen burner by inserting a relatively small tube into the mixing tube so that an annular space is formed about said small tube, the fuel from the usual nozzle first passing into the latter. The intended operation of this arrangement is to have the mixture of air and fuel formed in said inserted tube, gather up additional air by suction from the surrounding portion of the mixing tube, as it passes from the said inserted tube. The intended result, however is not attained with such construction as the resulting division of the energy available in the stream of gas and air must be accompanied'with a loss of energy at the second suction point so that the air introduced by suction is not increased as intended.

In cases where onlyalow gas pressure is available and the aid of a higher gas pressure cannot be invoked to increase the speed of the mixture it has been attempted to augment the volume of air sucked into the mix ing tube by increasing the length of the chimney and thus increasing the suction action in said mixing tube. This however necessitates a correspondingincrease in the cross-section of the mixing tube immediately adjacent the nozzle in order that the necessary increased amo'untof air may be supplied by the increased suction. On the other hand, it is necessary to have a mixlng tube of fixed or certain cross-section with a given nozzle, or with an air and fuel stream of given cross-section in order to secure a proper injector action in said stream. It will thus be seen that the increase in the cross-section of the mixing tube necessary to properly utilize the increased suction induced by the lengthened chimney will disadvantageously disturb the injector action of said stream of fuel which flows from said nozzle. I

Having knowledge of these facts the pres ent invention seeks toovercome these objections and with this in view accordingly maintains the fixed cross-section of that part of the mixing tube whichlies adjacent to the nozzle and which is required to insure a proper injector action in the stream of fuel and arranges an additional chamber about said mixing tube. This chamber is connected with the atmosphere and serves to supply additional air for mixing purposes by'the suction of the chimney. In this manner the suction of the chimney and the injector ac. tion of the "stream of fuel are prevented from interfering with or disturbing each T other and both sources of energy are utilized in their fullest strength.

Reference is tobe had to the accompanying drawings which by way of example illustrate my improvement applied to a petroleum incandescent lamp and in which- Figure 1 is a longitudinal section on the line 1-1 of Fig. 2 and Fig. 2 is a horizontal section on the line 22 of Fig. 1.

In the drawings 5 is a chimney which at its lower end is divided into two separate tubes 5 each of which communicates with the interior of the globe 6 supported on a suitable frame 7 in any well known manner, the customary shade 8 being providedand carried by the lamp in any desired way. A container or receptacle 9 for the fuel is located near the upper end of the chimney 5 and is connected by meansof a tube 10' with the nozzle 11, the tube 10 for a part of its length, at least, being located within the chimney 5 and tubes 5 'in the path of the products of combustion. secured in the lower closed end of the chimney 5 between the ends of the tubes 5 and The 'nozzle 11 is The lower In this manner the tubes 16 are in communication with the atmosphere.

In operation the fluid fuel flows, under hydrostatic pressure from the container 9 through the tube 10 in which the vaporization of said fuel take place under the influence of the combustion gases rising through the tubes 5 and chimney 5. The gaseous or vaporized fuel streams or flows from the nozzle 11 connected with said tube 10 into the injector tube 12 and becomes mixed therein with the air which is sucked into said tube 12. The suction induced by the chimney 5 and tubes 5 draws additional air through the transverse tubes 16 from the annular space 17 into the space 14 and interior of the mixing tube 13. The air supply in the space 17 is continually renewed through the air inlets 19. This additional air is addedto the mixture of air and fuel which passes from the injector tube 14 to the mixing tube 18 and becomes mixed therewith before the incandescent mantle 15 is reached. In thi manner it is possible to secure a highly effective Bunsen flame even when using vaporized petroleum as a fuel which latter requires a large amount of air for combustion purposes and which otherwise, under low pressure, does not receive, by suction of the injector action, the amount of air necessary to secure complete combustion and the intensity of flame required for illuminating urposes.

It is, of course, to be understood that the invention is not limited to the form illus trated and instead of being used in connection with vaporized petroleum, may also be used in connection with other gases or vapors rich in hydrocarbons. Furthermore the present improvement may readily be used satisfactorily in connection with fuel of poorer quality, such as ordinary illuminating gas, and when used will always insure, even with low gas pressure, a mixture of air and fuel of the required richness in air in the mixing tube, before the flame is reached.

Various changes in the form shown and described may be made within the scope of the claims without departing from the spirit of my invention.

I claim:

1. An inverted incandescent gas or vapor lamp comprising a chimney for the escape of the combustion products and adapted to produce suction, said chimney being divided at its lower end into two separate chimney tubes, a globe located below said chimney tubes and substantially closed for preventing the entrance of secondary air, a mixing of the combustion products and adapted to produce uction, said chimney being divided at its lower end into two separate chimney tubes, a globe located below said chimney tubes and substantially closed. for preventing the entrance of secondary air, a mixing tube located between said two chimney tubes and extending into the globe, said mixing tube being provided with openings for. supplying air thereto by means of theysuction of the chimney, an incandescent mantle carried by said mixing tube, a chamber surrounding said mixing tube and. connected with the outer air, an injector tube at the upper end of the mixing tube and of less diameter than the latter, and a nozzle adapted to deliver a mixture of air and gaseous or vaporized fuel to said injector tube.

3. An inverted incandescent gas or vapor lamp comprising a chimney for the escape of the combustion products and adapted to produce suction, said chimney being divided at its lower end into two separate chimney tubes, a. globe located below said chimney tubes and substantially closed for prevent ing the entrance of secondary air, a mixing tube located between said two chimney tubes and extending into the globe, an incandescent mantle carried by said mixing tube, transverse tubes located between the chimney tubes and connected with the mixing tube and with the atmosphere, an injector tube at the upper end of the mixing tube and of less diameter than the latter, and a nozzle adapted to deliver a mixture of air and gaseous or vaporized fuel to said injector tube. y

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

PRESTON DAVIES. WVitnesses:

VVOLDEMAR I-Iaurr, HENRY HASPER.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. C. 

